ALL-1999: Add Enrollment tab to field picker in stage requirements UI

completed

Priority: 3

Branch: wilbo/all-1999-enrollment-field-picker-tab

PR: #12800

Linear: ALL-1999

Frontend work, depends on ALL-1998 merging first. Add Enrollment section in FieldPicker.tsx so program admins can add enrollment-scoped custom fields as stage requirements. Files: apps/dashboard/packs/programs/components/configuration-v2/{FieldPicker,RequirementList,RequirementMetadataRow}.tsx. Queued pending ALL-1998.

Event Timeline

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Phase 1 complete. FieldPicker pattern: ENTITY_TABS drives tab bar; each tab filters fields prop by entityType. RequirementList calls useAvailableFields and passes to FieldPicker. LEGAL tab uses hardcoded LEGAL_FIELDS list. addCustomField mutation exists in backend (takes factKey, displayName, entityType, fieldType, lifecycleDefinitionId). Plan: add ENROLLMENT tab to ENTITY_TABS, wire enrollment custom fields, add inline create form with addCustomField mutation on ENROLLMENT tab only.

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lease expired — re-queued for retry

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PR #12800 — CI green again after 3 follow-up fix commits (7fcdde0, 08c196804e3, 5a1a7e4d313). MERGEABLE, REVIEW_REQUIRED. Will pinged.